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Me78569

Testing Injector Pop Pressure in the real world

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On 2/19/2018 at 7:06 PM, Me78569 said:

Another day of temps below ~15* and another day of hard starts when cold.  

 

@Me78569 I was wondering how your truck started this morning. My overhead showed -14 coming down Monument this morning at 6am. 

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Ok so just got re-reading through this entire thread as I finally got bigger injectors 7x.012 (should be here today!) and they're currently set to 350 bar and based on this thread, it seems like setting them to 330 with the expectation they'll drop 10ish bar, that would keep them in the happy area for the VP as well as a good spot for that sized injectors.

 

Can someone back me up on that thought process??

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4 minutes ago, notlimah said:

 

Can someone back me up on that thought process??

That's what I'm planning on doing some day, I just hate the fact that I have to mess with injection lines that are not currently leaking :whistle:

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If you don't have any negative effects like stalling or hard cold-starting, I wouldn't be afraid to run 350. Just be aware that those are known side effects.

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Well I'm going to bring back up this old thread. Now that the temps have gotten hot I am 100% decided that I have to bring my pot pressures back down. Unless I run at least two quarts of two-stroke oil and let off the throttle just right when slowing down the truck will look so bad that it dies. It has almost gotten me into a couple accidents when the power steering stops going around the corner. It has always done this a little bit but the higher Pop pressure has exaggerated it and it cannot be driven this way. I'm at the point where I don't believe that there is much of any benefit to raising the pop pressure. Also now that it's hot out it's hard for me to drive smoke free and it is hazier at idle than I expected as well. Overall I guess I just don't see this as being a benefit really. Once I can get to a point where my truck can be down for a couple weeks I will probably pull injectors and have them repop 2 somewhere around 310bar I believe

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It appears you have a manual transmission, I am not sure how the power steering would be effected with the clutch out an in gear?? It would just be like coasting, which is 0 fuel being injected as well. 

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5 minutes ago, AH64ID said:

It appears you have a manual transmission, I am not sure how the power steering would be effected with the clutch out an in gear?? It would just be like coasting, which is 0 fuel being injected as well. 

You're right but I can't always be in gear and coasting. Going around the corner trying to shift and it dies. I'd have to 100% change my driving Style 2 leaving it in gear at every single opportunity that I could. It's nearly impossible to make it not lope and the hotter it is outside the worse it is.

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2 minutes ago, Mopar1973Man said:

 

Betcha if they where stock it would hold up better. 

Agree but unfortunately I don't have that option. Still doesn't change my mind that the benefit is very slight in my opinion. Not likely worth the probable added wear

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I had about 25k on my injectors with 350 and 330 bar.  some 80+ days and some 0 days.   

 

Highway towing etc.    I think 340 is too high.  I think 330 was about right for my application.  I seen a pretty big difference going to 330 from stock, but not a huge amount going from 330 to 350, and there were draw backs at 350 like you are seeing.  

 

 

I really dont see how it could wear more truthfully.  The pump is going to create WAY more pressure during the stroke than the pop pressure.  

 

Remember Bosch says 327 bar is within spec.

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On 6/13/2018 at 9:32 PM, Me78569 said:

Highway towing etc.    I think 340 is too high.  I think 330 was about right for my application.  I seen a pretty big difference going to 330 from stock, but not a huge amount going from 330 to 350

 

So would a safe bet be get pop pressure set to 330 and have it drop to 320 or so? DD with hauling wood/dirt here and there…

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